Lens Module

ABSTRACT

A lens module is disclosed. The lens module includes a lens barrel including a first barrel wall extended horizontally and a second barrel wall extended from the first barrel wall; a lens group including at least one lens, the lens includes a first slope; a stop on the first barrel wall and forming a light hole for the lens, and a pressing ring attached to the stop. The first barrel wall of the lens barrel includes a second slope abutting against the first slope for ensuring the concentricity.

FIELD OF THE DISCLOSURE

The present utility relates a lens module, particularly the lens moduleof mobile phones, digital cameras, PDAs and note books and otherelectronic products.

BACKGROUND

As the photographic technology and the electronic products withphotographic function are developed in recent years, optical camera lensmodule is used widely in all kinds of products. In order to follow thecurrent trend that the size of electronic products is smaller, the lensmodule shall also be smaller.

In the existing technology, the lens module comprises a lens barrel,lenses installed in the lens barrel and a stop clamped between thelenses. The lens barrel comprises a first barrel wall extendedhorizontally and a second barrel wall extended from the first barrelwall. A light hole is created on the first barrel wall for the lens.However, the light hole on the first barrel wall requires the barrelwall with a certain thickness, therefore, the wall thickness of thebarrel wall is increased, and the height and weight of the entire lensmodule is increased. It will be more difficult to produce the lensbarrel. In the existing technology, a slope is also provided on thefirst barrel wall at the position of the light hole, so, the difficultyof production is increased further.

For this reason, it is necessary to provide a novel lens module toovercome the shortcomings above.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the embodiment can be better understood with referenceto the following drawings. The components in the drawing are notnecessarily drawn to scale, the emphasis instead being placed uponclearly illustrating the principles of the present disclosure. Moreover,in the drawings, like reference numerals designate corresponding partsthroughout the several views.

FIG. 1 is an illustration of a lens module in accordance with anexemplary embodiment of the present disclosure.

FIG. 2 is an illustration of a lens barrel of the lens module in FIG. 1.

FIG. 3 is an illustration of the lens group in the lens module in FIG.1.

DETAILED DESCRIPTION

The present disclosure will be described in detail below with referenceto the attached drawings and an exemplary embodiment thereof.

As shown in FIG. 1, a lens module 100 in accordance with an exemplaryembodiment of the present disclosure comprises a lens barrel 1, a lensgroup 2 installed in the lens barrel 1, a stop 3 installed on the lensbarrel 1, and a pressing ring 4 attached to the stop 3.

As shown in FIG. 2, the lens barrel 1 comprises a first barrel wall 11extended horizontally and a second barrel wall 11 extended downward fromthe first barrel wall 11. A receiving space 13 is formed by the firstbarrel wall 11 and the second barrel wall 12. The lens barrel 1 isprovided with a lug 14 extended from the inner surface of the firstbarrel wall 11 to the central axis of the lens barrel 1. A groove 15 iscreated by the lug 14 and the inner surface of the lens barrel 1. Thegroove 15 communicates with the receiving space 13. The stop 3 islocated partially in the groove 15. The lug 14 on the first barrel wall11 creates a hole 111 which is connected to the receiving space 13. Thelug 14 is provided with a second slope 112.

As shown in FIG. 3, the lens group 2 comprises a first lens 21 and asecond lens 22 which is stacked on the first lens 21. The lens group 2in this embodiment comprises two lenses. In other embodiments, the lensgroup can comprise one lens or more than two lenses. The first lens 21comprises a first surface 211 far from the second lens 22 and a secondsurface 212 opposite to the first surface. The first lens 21 comprises aprotruding portion 213 and a peripheral portion 214 around theprotruding portion 213. The first surface 211 of the first lens 21comprises in turn from external to internal a first flat surface 215extended horizontally, a first slope 216 against the second slope 112, asecond flat surface 217 extended horizontally and a first opticalsurface 218. The first flat surface 215, the first slope 216 and thesecond flat surface 217 are located at the peripheral portion 214 of thefirst lens 21. The first optical surface 218 is a circular arc surfaceand is located on the protruding portion 213 of the first lens 21. Theinclination of the first slope 216 and the inclination of the secondslope 112 are same so that the first slope 216 and the second slope 112are fit fully each other. A gap is created between the second flatsurface 217 and the stop 3. In other embodiments, the second flatsurface 217 and the stop 3 can be fit fully each other. The peripheralportion 214 of the first lens 21 is clamped between the first barrelwall 11 and the second lens 22. The optical axis of the first lens 21,the lens 22 and the central axis of the lens barrel 1 are aligned in onestraight line.

The stop 3 is located partially in the groove 15 on the first barrelwall 11 of the lens barrel 1 and extended horizontally and inwardlybeyond the lug 14. The stop 3 comprise a light hole 31 for theprotruding portion 213 of the first lens 21. The stop 3 is a hollowring. The aperture of the light hole 31 is smaller than the aperture ofthe hole 111. The central axis of the stop 3, the optical axis of thelens group 2 and the central axis of the lens barrel 1 are aligned inone straight line. The stop 3 contacts both sides of the first opticalsurface 218 of the first lens 21.

The press ring 4 is installed in the groove 15 of the lens barrel 1 andis pressed on the stop 3, thereby the stop 3 is fixed more stably. Athird slope 41 is provided at the edge of the press ring 4. The thirdslope 41 and the inner surface of the lens barrel 1 create the gluegroove 42. The press ring 4 is fixed by glue 5 on the lens barrel 1, andthen the stop 3 is clamped between the press ring 4 and the lens barrel1. The press ring 4 can also installed with an interval to the lensbarrel 1 in horizontal direction, so that a gap is created between thepress ring and the lens barrel. A glue groove for receiving the glue iscreated by the outer wall of the press ring and the inner surface of thelens barrel and the stop. The stop can be fixed directly by glue on thelens barrel. The press ring 4 is made of plastic or metal.

When assembling the lens module 100, the lens barrel 1 and the stop 3are installed first. The stop 3 is installed in the groove 15 of thelens barrel 11. The press ring 4 is pressed on the stop 3 and fixed byglue 5 in the glue groove 41 created by the inner surface of the firstbarrel wall 11. The central axis of the stop 3 and the central axis ofthe lens barrel 1 are aligned in one straight line. The first lens 21 isinstalled in the lens barrel 1. The first flat surface 215 of the firstlens 21 is against the first barrel wall 11 of the lens barrel 1. Thefirst slope 216 of the first lens 21 is against the second slope 112 ofthe first barrel wall 11. The fit between the slopes ensures theconcentricity between the first lens 21 and the lens barrel 1. The firstlens 21 can be pressed precisely into the lens barrel 1. The opticalsurface 218 of the first lens 21 is extended beyond the light hole 31 ofthe stop 3. The edge of the first lens 21 has press fit with the innersurface of the second barrel wall 12 of the lens barrel 1. The secondlens 22 is installed under the first lens 21. The edge of the secondlens 22 has press fit with the inner surface of the second barrel wall12 of the lens barrel 1. Certainly, the first lens 21 and the secondlens 22 can be also put directly into the lens barrel 1 and no press fiton the inner surface of the lens barrel 1. At last, the second lens 21is fixed further by glue in the lens barrel 1. At this point, theassembling of the lens module 100 is finished.

The stop 3 can block off stray light, moreover, the stop 3 can createdirectly the light hole 31 for the protruding portion 213 of the firstlens 21. The wall thickness of the first barrel wall 11 can be verythin, thereby the height and weight of entire lens module 100 arereduced, conforming to the miniaturization trend of equipment atpresent. At the same time, the lens barrel 1 with smaller wall thicknessis convenient to be produced with high yield of qualified products andother advantages.

It is to be understood, however, that even though numerouscharacteristics and advantages of the present embodiment have been setforth in the foregoing description, together with details of thestructures and functions of the embodiment, the disclosure isillustrative only, and changes may be made in detail, especially inmatters of shape, size, and arrangement of parts within the principlesof the invention to the full extent indicated by the broad generalmeaning of the terms in which the appended claims are expressed.

What is claimed is:
 1. A lens module, comprising: a lens barrelincluding a first barrel wall extended horizontally and a second barrelwall extended from the first barrel wall; a lens group including atleast one lens, the lens includes a first slope; a stop on the firstbarrel wall and forming a light hole for the lens; a pressing ringabutting against the stop; wherein the first barrel wall of the lensbarrel includes a second slope abutting against the first slope.
 2. Thelens module as described in claim 1, wherein the lens barrel includes alug extended from an inner surface of the first barrel wall toward acentral axis of the lens barrel, and a groove is created by the lug andthe inner surface of the lens barrel for at least partially receivingthe stop.
 3. The lens module as described in claim, wherein the lensbarrel is provided with a lug extended from the inner surface of thefirst barrel wall to the central axis of the lens barrel, a groove iscreated by the lug and the inner surface of the lens barrel forpartially receiving the stop.
 4. The lens module as described in claim3, wherein a glue groove for receiving the glue is provided between thepress ring and the lens barrel.
 5. The lens module as described in claim4, wherein a third slope is provided at an edge of the press ring, thethird slope and the inner surface of the lens barrel create the gluegroove.
 6. The lens module according to claim 1, wherein the press ringis made of plastic or metal.
 7. The lens module as described in claim 1,wherein the stop is a hollow ring.
 8. The lens module as described inclaim 1, wherein an optical axis of the lens, the central axis of thelens barrel and an central axis of the stop are aligned in one straightline.
 9. The lens module as described in claim 1, wherein the lensfurther comprises a protruding portion and a peripheral portion aroundthe protruding portion, the protruding part extends beyond the lighthole created by the stop.
 10. The lens module as described in claim 9,wherein a gap is created between the peripheral portion and the stop.